﻿/*
 * Twipler - Twitter Web Client with features.
 *  
 *  Copyright (C) 2009, 2010. Ian Quigley
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details. 
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Twipler.App.Machine.Instructions
{
    [InstructionAttibute("Jump If True popped from stack",pops=1,pushes=0)]
    public class JumpIf : BranchInstruction
    {
        public JumpIf(string name, int delta) : base(name, delta) { }

        public override void Exec(Environment env)
        {
            if ((bool)env.Stack.Pop())
                env.Index += Delta - 1;            
        }

		public override string ToString()
		{
			return "jumpif " + Delta;
		}
    }
}